• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2016.06a
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• pp.16-18
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• 2016

본 논문에서는 몽골 지역에 발생하는 지진이 대규모 집단 거주지 및 상업 지역인 울란바타르(Ulaanbaatar) 도심지역에 큰 피해를 주고 있는바, 지진재난경보시스템 개발하여 현장에 구축함으로써 신속히 지진발생 상황을 전파하여 몽골 국민의 생명을 보호하고 재산피해를 줄이는데 역할을 수행할 수 있다. 울란바타르 외곽에 지진파를 감지할 수 있는 지진센서를 설치하고, 지진파를 수집하여 분석하고 진도의 단계에 따라 이벤트를 발생한다. 지진의 세기에 따라 단계별 상황을 판단하고 시민들이 빠른 대피를 할 수 있도록 울란바타르 도심지역에 경보방송을 전달함으로써 지진 피해를 최소화 시킬 수 있다.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2011.07a
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• pp.162-163
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• 2011

이 논문에서는 최근 널리 사용되고 있는 소셜미디어를 지진정보전달과 관련된 특성 위주로 분석하고, 가장 적합한 소셜미디어 서비스를 이용하여 지진정보를 전달하는 시스템 개발에 대해 설명한다. 먼저 소셜미디어의 전달 특성을 분류하여 가장 적합한 소셜미디어 서비스를 선택한다. 그리고 해외에 유사한 서비스를 조사하여, 이와 같은 서비스가 효용성을 가질지 판단한다. 이를 바탕으로 지진정보전달시스템을 개발하여 소셜미디어를 활용한 지진정보전달 서비스 환경을 구축한다. 이 논문에서 개발한 시스템은 현재 실제 기상청에서 테스트를 진행하고 있으며, 테스트를 마칠 경우 실제 운영을 시작할 계획이다. 본 서비스를 시작할 경우 다양한 전달매체, 특히 비교적 안정적인 매체를 통해 지진정보를 이용할 수 있게 될 것이다.

• Proceedings of the Korea Contents Association Conference
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• 2011.05a
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• pp.153-154
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• 2011

최근 발생한 일본 동북부의 대지진과 이에 동반된 해일은 막대한 재산손실과 인명피해를 가져왔다. 일본에 인접한 우리나라도 규모 3~4의 지진이 빈번히 일어나고 있고, 그 이상의 규모 지진도 간혹 발생하고 있다. 따라서 더 이상 한국이 지진과 해일의 안전지대라고 안심할 수 없는 상황이다. 이에 본 논문은 지진과 함께 동반되는 해일에 대비하기 위한 경보 및 상황 보고 시스템의 필요성을 제시하고, 사용자들이 경보를 받을 뿐 아니라 스마트폰을 이용한 SNS와 GPS를 이용하여 실시간으로 상황 보고에 대한 의견 교환을 하면서 함께 대피하도록 돕는 실시간 경보 및 상황 보고 시스템을 제안한다.

• Geophysics and Geophysical Exploration
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• v.13 no.3
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• pp.268-276
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• 2010

Earthquake Hazard Mitigation Law was activated into force on March 2009. By the law, the obligation to monitor the effect of earthquake on the facilities was extended to many organizations such as gas company and local governments. Based on the estimation of National Emergency Management Agency (NEMA), the number of free-surface acceleration stations would be expanded to more than 400. The advent of internet protocol and the more simplified operation have allowed the quick and easy installation of seismic stations. In addition, the dynamic range of seismic instruments has been continuously improved enough to evaluate damage intensity and to alert alarm directly for earthquake hazard mitigation. For direct visualization of damage intensity and area, Real Time Intensity COlor Mapping (RTICOM) is explained in detail. RTICOM would be used to retrieve the essential information for damage evaluation, Peak Ground Acceleration (PGA). Destructive earthquake damage is usually due to surface waves which just follow S wave. The peak amplitude of surface wave would be pre-estimated from the amplitude and frequency content of first arrival P wave. Earthquake Early Warning (EEW) system is conventionally defined to estimate local magnitude from P wave. The status of EEW is reviewed and the application of EEW to Odesan earthquake is exampled with ShakeMap in order to make clear its appearance. In the sense of rapidity, the earthquake announcement of Korea Meteorological Agency (KMA) might be dramatically improved by the adaption of EEW. In order to realize hazard mitigation, EEW should be applied to the local crucial facilities such as nuclear power plants and fragile semi-conduct plant. The distributed EEW is introduced with the application example of Uljin earthquake. Not only Nation-wide but also locally distributed EEW applications, all relevant information is needed to be shared in real time. The plan of extension of Korea Integrated Seismic System (KISS) is briefly explained in order to future cooperation of data sharing and utilization.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2011.07a
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• pp.143-147
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• 2011

3월11일 오후 2시46분경 일본 동북지역을 중심으로 M. 9.0 규모의 동일본대지진이 발생해 수많은 희생자가 나왔다. 지진발생 후 쓰나미가 일어나 방사선이 대량으로 유출되는 등 일본사상 최대의 국가적인 복합재난이 일어났다. 그럼에도 불구하고, 일본인들이 침착함을 잃지 않은 시민의식에 대해 세계 시민들은 극찬을 아끼지 않았다. 우리나라도 국가적으로는 대형 재난발생 시를 대비하여 행정안전부, 방송통신위원회, 소방방재청, 기상청, KBS, 재난전문가 등으로 구성된 가칭 "긴급재난방송협의회" 같은 것을 구성하여 긴밀하게 재난정보를 교환하는 유기적인 협력체제구성이 필요하다. 또, 나아가서는 이들 관련 부서에서는 재난방송 전담관을 두어 재난방송에 적극적으로 대처하여야 할 것으로 본다. 정부도 KBS에 대해 대폭적인 지원을 아끼지 않아야 하겠지만, KBS 또한 지금까지의 대응 자세에서 벗어나 "재난방송의 선진화"를 위해 재난방송시스템을 새로 구축해야 할 것이다. 마지막으로 KBS는 NHK의 지상파방송과 같이 KBS 위상에 걸 맞는 재난방송시스템을 구축하는 한편, 디지털시대에 있어서의 뉴 미디어를 이용하여 DMB나 스마트 폰, SNS 등을 이용한 각종 재난경보체제를 선도해야 할 재난주관방송사로서의 의무가 있다. 그것이 곧 공영방송의 본연의 임무이자 국민의 생명과 재산을 지키는데 최선을 다하는 길이다.

• Earthquakes and Structures
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• v.22 no.1
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• pp.53-64
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• 2022

This study proposes an intelligent semi-active isolation system combining a variable-stiffness control device and ground motion characteristic prediction. To determine the optimal control parameter in real-time, a genetic algorithm (GA)-fuzzy control law was developed in this study. Data on various types of ground motions were collected, and the ground motion characteristics were quantified to derive a near-fault (NF) characteristic ratio by employing an on-site earthquake early warning system. On the basis of the peak ground acceleration (PGA) and the derived NF ratio, a fuzzy inference system (FIS) was developed. The control parameters were optimized using a GA. To support continuity under near-fault and far-field ground motions, the optimal control parameter was linked with the predicted PGA and NF ratio through the FIS. The GA-fuzzy law was then compared with other control laws to verify its effectiveness. The results revealed that the GA-fuzzy control law could reliably predict different ground motion characteristics for real-time control because of the high sensitivity of its control parameter to the ground motion characteristics. Even under near-fault and far-field ground motions, the GA-fuzzy control law outperformed the FPEEA control law in terms of controlling the isolation layer displacement and the superstructure acceleration.

• Korean Journal of Hazardous Materials
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• v.3 no.1
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• pp.28-36
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• 2015

In early 2011, the Fukushima nuclear power plant had greater damage due to earthquake in Japan, and the awareness of safety has increased. In particular, special response systems should be required to handle disaster situations in plant sites which are likely to occur for large disasters. In this study, a program is designed to set up optimum escape routes, by a smart phone application, when a disaster situation occurs. This program could get information of the cumulative damage from sensors and display the escape route of the smallest damage in real-time on the screen. Utilizing our application in real-time evacuation has advantage in reducing cumulative damage. The optimal evacuation route, focusing on horizontal path, is calculated based on getting the data of fire, detected radioactivity and hazardous gas. Thus, using our application provides information of optimal evacuation to people who even can not hear sensor alarms or do not know geography, without requiring additional costs except fixed sensors or server network deployment cost. As a result, being informed of real-time escape route, the user could behave rapidly with suitable response to individual situation resulting in improved evacuation than simply reacting to existing warning alarms.

• Journal of Korean Society of Coastal and Ocean Engineers
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• v.18 no.4
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• pp.269-282
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• 2006

We numerically studied tsunami propagation characteristics through Korean Straits based on nonlinear shallow water equation, a robust wave driver of the near field tsunamis. Tsunamis are presumed to be generated by the earthquake in Tsuhima-Koto fault line. The magnitude of earthquake is chosen to be 7.5 on Richter scale, which corresponds to most plausible one around Korean peninsula. It turns out that it takes only 60 minutes for leading waves to cross Korean straits, which supports recently raised concerns at warning system might be malfunctioned due to the lack of evacuation time. We also numerically obtained the probability of tsunami inundation of various levels, usually referred as tsunami hazard, along southern coastal area of Korean Peninsula based on simple seismological and Kajiura (1963)'s hydrodynamic model due to tsunami-generative earthquake in Tsuhima-Koto fault line. Using observed data at Akita and Fukaura during Okushiri tsunami in 1993, we verified probabilistic model of tsunami height proposed in this study. We believe this inundation probability of various levels to give valuable information for the amendment of current building code of coastal disaster prevention system to tame tsunami attack.

• Journal of the Society of Disaster Information
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• v.16 no.1
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• pp.133-143
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• 2020

Purpose: This study aims to derive a predictive empirical equation for PGV prediction from P-wave using earthquake records in Korea and to verify the reliability of Onsite EEW. Method: The noise of P wave is removed from the observations of 627 seismic events in Korea to derive an empirical equation with PGV on the base rock, and reliability of Onsite alarms is verified from comparing PGV's predictions and observations through simulation using the empirical equation. Result: P-waves were extracted using the Filter Picker from earthquake observation records that eliminated noises, a linear regression with PGV was used to derive a predictive empirical equation for Onsite EEW. Through the on-site warning simulation we could get a success rate of 80% within the MMI±1 error range above MMI IV or higher. Conclusion: Through this study, the design feasibility and performance of Onsite EEWS using domestic earthquake records were verified. In order to increase validity, additional medium-sized seismic observations from abroad are required, the mis-detection of P waves is controlled, and the effect of seismic amplification on the surface is required.

• Journal of Korean Society of Coastal and Ocean Engineers
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• v.28 no.5
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• pp.265-276
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• 2016

The 2011 Tohoku, Japan Tsunami, which occurred on March 11, 2011, reached the Korean Peninsula and was recorded at numerous tide stations. In the records of the north-eastern tide stations, tsunami forerunners were found in only about a few minutes after the earthquake, which was much earlier than the expected arrival time based on a numerical simulation. Murotani et al. (2015) found out that the bathymetry effect is related to the tsunami forerunners observed in Japan and Russia. In this study, the tsunami forerunners observed in Korea were well reproduced by a numerical simulation considering the bathymetry effect. This indicates that it is important to consider the bathymetry effect for a tsunami caused by an earthquake on shallowly dipping fault plane(e.g. 2011 Tohoku, Japan Earthquake). However, since the bathymetry effect requires additional computation time, it is necessary to examine the problems that results from applying the bathymetry effect to the tsunami warning system.